Power-hammer.



J. W. KEELEY.

POWER HAMMER.

APPLICATION FILED MAR. 4 1908.

904,701 Patented Nov. 24, 1908.

Snuentoz UNITED STATES PATENT OFFICE.

POWER-HAWK.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed March 4, 1908. Serial No. 419,205.

and useful improvements in power hammers of the fluid ,opei ated type, and the invention has for its object simple, durable and efficient' means for guiding the die of the hammer in its operation so as to effect the com-- pletion of the operation quickly and in an effective manner.

While the invention is applicable to riveting hammers generally, it is designed in the present instance particularly for riveting stay bolts or stay rods, of boilers, while the rivet ends of such bolts or rods are either hot or cold.

With this and other objects in view as will more fully appear as the description proceeds, the invention consists in certain constructions, arrangements and combinations of the parts that I shall hereinafter fully describe and then point out the novel features in the appended claim.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and accompanyingr drawings, in which:

igure 1 is a side elevation of a fluid operated power hammer provided with the improvements of my invention; Fig. 2is an enlarged longitudinal sectional view of the die end of the hammer with my invention applied; Fig. 3 is a. similar view illustrating the application of the device at different stages of its operation; and, Fig. 4 is a diagrammatic view, hereinafter specifically referred to.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawing, the numeral 1 designates the body portion of a pneumatic or other fluid 0 erated power hammer, which may be of any esired design or type suitable for riveting, and 2 designates the die thereof, said die being provided with a convex striking head 3.

My invention consists essentially of a guide member for holding the hammer properly against the work and controlled by the ordinary skill of the rivet er. In the present instance, the said guide member, designated 4, embodies a sleeve which is substantially cylindrical as shown, although it is to be understood that my invention is not limited in this respect, but that any'modification of such sleeve may be made that will come within the scope of the invention as defined in the appended claims. The guide member 4 is shaped on its interior atone end, as indicated at 5, so that it may be readily slipped over the end of the body portion 1 of the hammer and it may be properly secured to said body portion by any desired means. In the present instance, I have shown, for this purpose, a split ring 6 which is preferably constructed of comparatively heavy spring steel of the best quality and which is formed with inwardly turned lower and upper ends that. are designed to fit snu ly in annular grooves 7 and 8 formed in t e contiguous ends of the guide member 4 and body portion 1, respectively. The clasping ends of the ring 6 should be preferably so made that when the ring is applied to the hammer and to the guide member, the split portion or ends will meet, and care is to be taken in the construction and proportion of the parts that they will so fit together when joined as to avoid or minimize move ment of the guide member that the vibration of the hammer-would tend to produce.

In the ractical operation of my invention, which may be either embodied as a permanent part of the hammer or as an attachment therefor and capable of being removed therefrom, the guide member 4 is rested, say, against the outer face of a boiler sheet A, the stay bolt or stay rod on to be riveted projeetin into the open outer end of the guide mem er, the interlor wall thereof at such end resting against the side of the bolt end to be formed. The pneumatic, steam, or other fluid pressure is then turned on to effect the accustomed repeated vibration of the hammer against the riveting die 2 and in the operation of forming the head, the tool is given a circular rolling movement upon the stay bolt or stay rod, as a pivot, such.motion being an eccentric motion as wilLbe evident and being referably free from any slidin connection etween the interior wall of t e guide member 4 and the bolt. By such motion, it will be clear that the die will be carried around the margin of the bolt or rod forjthe initial and subsequent spreading ormashing operations until the bolt is finally and elfectively shaped. In Fig. 3 is illustrated in full lines a bolt artially completed and in dotted lines, in iinished condition. In Fig. 4, is illustrated in full and dotted lines and diagrammatically, two positions of the die and guide member upon the head of the stay bolt or rod, it being clear from this view. that the guide member has imparted to it an eccentric rolling or rotarymotlon upon the rod a as a pivot, in the direction of the darts, commencing, say, at the point :12 around to the point 3 and so on, until the bolt has been nally formed.

It is to be particularly noted, that by the means of my inventi n, the ball shaped or convex head 3 of the rivet die 2 bears at all times upon the end of the stay bolt or rod to tion with the accompanying drawing, it will be seen that I have provided a very simple, durable and efficient construction of means for guiding a riveting die in operation, which will result in the formation of a properly rounded and steam tight bolt in a very expeditious manner, thereby saving time and effecting economies I in the manufacture of boilers and other articles to which my invention is applicable.

Preferably the guide member 4 is formed near its outer end with a plurality of openings 9, so that the Workman may at all times view the work as it progresses.

Having thus described the invention, What is claimed as new is:

The combination with a hammer of the character described, and its die, of a guide member carried by the hammer and provided with an openin of greater diameter than the operative surface of the die, the die being formed with a convex striking head, as and for the purpose set forth.

'In testimony whereof I aflix my signature in presence of two Witnesses.

JAMES W. KEELEY. 

